Question

First ionisation potential of magnesium is greater than that of
aluminium because.........
1.Aluminium has a stable electronic configuration
2.The electron affinity of Magnesium is positive
(energy is absorbed)
3. Magnesium has a stable electronic configuration
4.Aluminium atom is very large when compared to
Mg​

Answer 1

Answer:

If we compare the ionization energy between magnesium and aluminium, the magnesium has greater ionization energy as it has less no of shells which are closer to the nucleus. ... Therefore, the force of attraction between nucleus and the electrons decreases. Thus, it can remove electrons with less energy.

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Answer 2

Answer:

3. Magnesium has a stable electronic configuration

Explanation:

• Although the nuclear charge of aluminum is greater than that of magnesium, that is of Mg is greater than that of Al. It is because the Mg atom has a more stable configuration than the Al atom.
• If we compare the ionization energy between magnesium and aluminum, magnesium has greater ionization energy as it has less no of shells that are closer to the nucleus. Al has one unpaired electron in its highest energy orbital (3p), and Mg's highest energy orbital (3s) the electrons are paired.